These are Mezzuzahs. At every entry, you find this on the right side of doorframes. Inside is the officially hand-written scripture verses; Deuteronomy 6:4-9 and 11:13-21. "Doorframes" in Verse 9 is Mezzuzah in Hebrew. Below left are the ones we have at every doorframe throughout the house, and below right is the one at the main entrance to the house.

A mezzuzah is fixed slanted. At a first glance, I thought they did not care enough to place it straight, but I learned later that it should be angled inward. Our small room has two doors (one to hallway and one to balcony) so two mezzuzahs. We are protected by God's words every day. Below is the famous mezzuzah at Jaffa Gate in Jerusalem.

4 Hear, O Israel: The Lord our God, the Lord is one.[a]

5 Love the Lord your God with all your heart and with all your soul and with all your strength.

6 These commandments that I give you today are to be on your hearts.

7 Impress them on your children. Talk about them when you sit at home and when you walk along the road, when you lie down and when you get up.

8 Tie them as symbols on your hands and bind them on your foreheads.

9 Write them on the doorframes of your houses and on your gates.

Deuteronomy 6

"Hear O Israel (Shama Israel)" is the center prayer for Jews. They pray with the tune to the verse.Like this..

"On your hand" and "on your foreheads" in verse 8 look like this. The little box is called Tefillin.